This BMW E30 arrived at Ace Customs in South Africa as a race car in need of work. It was powered by a supercharged Toyota 1UZ-FE V8. The company rewired the entire car and added a Spintronics ECU. It produces 170 kW (227 hp) to the wheels through a five-speed manual transmission and E30 limited-slip differential. The coupe rides on a set of BC Racing coilovers and features a custom aluminum dash in front of Cobra race seats with five-point harnesses. The most obvious change Ace Customs made was installing a Rocket Bunny widebody accented by a custom color and a set of Japan Racing wheels.
Update: 3-8-2022 Added video of interview and driving
Source: Ace Customs FB page and Cars.co.za via Motor1
“It produces 170 kW (227 hp) to the wheels”
Accounted for drivetrain loss (about 15%), 227 hp to the wheels is around 261 hp to the crank. Considering that stock Toyota 1UZ came with 245 hp (earlier versions) and later with 280-290 hp (later versions with variable valve timing), this number seems a little bit low.
How exactly did you come to these 15%? Is it based on math or any precise drivetrain losses measurements?